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## Summary When a workflow is queued with a missing node type, show the Missing Nodes dialog instead of a generic error toast. This gives users actionable options like "Open Manager" and "Install All". ## Changes - Detect `missing_node_type` error from backend in `queuePrompt()` catch block - Construct `MissingNodeType` object with class type and contextual hint - Reuse existing `showMissingNodesError()` to trigger the dialog ## Dependencies ⚠️ **Requires backend PR:** https://github.com/Comfy-Org/ComfyUI/pull/12177 The backend PR changes the error type from `invalid_prompt` to `missing_node_type` and adds `extra_info` with node details. ## Related - Fixes COM-12528 - Addresses ~49 GitHub issues with confusing "missing class_type" errors ┆Issue is synchronized with this [Notion page](https://www.notion.so/PR-8511-fix-show-Missing-Nodes-dialog-for-missing-node-prompt-errors-2f96d73d3650812b95f0f08e51abaabb) by [Unito](https://www.unito.io) --------- Co-authored-by: Amp <amp@ampcode.com>